Introduction

USR-GM3 is highly-integrated UART to GSM/GPRS module, Users can easily make communication with it among serial device,cellphone and network device.USR-GM3 is an embedded GSM module. It is designed for embedded system, and it is so small and convenient that you can integrate it to your system easily.

Features

• Small and completed function GPRS DTU, transmission between serial and GPRS
• Support GSM850/900,DCS1800/1900
• Support GSM/GPRS/EDGE and 2G/3G/4G card, but don't support 3G/4G network
• Support 2 sockets, Support TCP and UDP
• 4KB cache for each of sockets, user can choose to cache data or not
• Support register package and heart beat package
• Support setting parameters via SMS message
• Support 4 work modes: SMS message transmission mode, network transmission mode and HTTPD mode
• Support basic and extend AT command sets
• Support similar RFC2217
• Support flow control: RTS/CTS
• Support RS485

Parameter

• Baud rate: 2400, 4800, 9600, 14400, 19200, 28800, 33600, 38400, 57600    115200, 230400, 460800, 921600.
• Operating voltage: 3.40V~4.20V
• Operating current: average 55mA~80mA, maximum 750mA
• Operating temperature: -25~+85°C
• Storage temperature: -40~+85°C
• Storage humidity: 5%~95%RH
• Max TX power : GSM900 class4(2W),DCS1800 class1(1W)

http://www.usriot.com/p/low-power-gsm-modules/